So the surface area of this figure is 544.
#Area of rectangle formula missing width plus#
So one plus nine is ten, plus eight is 18, plus six is 24, and then you have two plus two plus one is five. To open it up into this net because we can make sure We get the surface area for the entire figure. And then you have thisīase that comes in at 168. You can say, side panels, 140 plus 140, that's 280. 12 times 12 is 144 plus another 24, so it's 168. Region right over here, which is this area, which is Just have to figure out the area of I guess you can say the base of the figure, so this whole And so the area of each of these 14 times 10, they are 140 square units. Now we can think about the areas of I guess you can consider It would be this backside right over here, but You can't see it in this figure, but if it was transparent, if it was transparent, So that's going to be 48 square units, and up here is the exact same thing. Thing as six times eight, which is equal to 48 whatever Here is going to be one half times the base, so times 12, times the height, times eight. Now, if we replace the above formula of length in the area of rectangle formula, then, the area of the rectangle formula can be expressed as follows, Area of rectangle (Diagonal) 2 - (Width) 2 × Width So, Area of a Rectangle Width (Diagonal) 2 - (Width) 2 We can use the same formula if we know the length and if the width is missing. Of this, right over here? Well in the net, thatĬorresponds to this area, it's a triangle, it has a base Another common shape is a cylinder to find its volume, multiply the height of the cylinder by the area of its base ( × r). One of the most popular shapes is a rectangular prism, also known as a box, where you can simply multiply length times width times height to find its volume. So what's first of all the surface area, what's the surface area The volume formula depends on the shape of the object. We can just figure out the surface area of each of these regions. So the surface area of this figure, when we open that up, And when you open it up, it's much easier to figure out the surface area. So if you were to open it up, it would open up into something like this. Where I'm drawing this red, and also right over hereĪnd right over there, and right over there and also in the back where you can't see just now, it would open up into something like this.
It was made out of cardboard, and if you were to cut it, if you were to cut it right
Video is get some practice finding surface areas of figures by opening them up intoĪbout it is if you had a figure like this, and if
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